How many swings must be made in order to use a pump that captures 40 cm3 of air at each swing to fill the empty tube of a bicycle tire so that the area of its contact with the road is equal to 60 cm2? The load on the wheel is 35 kg, the volume of the chamber is 2000 cm3. Atmospheric pressure 1 atm. Assume that the volume of the tire does not change when inflated. When heated during driving, the pressure in the chamber increases. Determine the decrease in the area of contact with the road if the tire is heated from 20 to 60 ° C. The volume is still considered constant.

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